US5578228A - Process for the laser beam cutting of strip or plate workpieces, especially magnetic steel sheets - Google Patents

Process for the laser beam cutting of strip or plate workpieces, especially magnetic steel sheets Download PDF

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Publication number
US5578228A
US5578228A US08/379,665 US37966595A US5578228A US 5578228 A US5578228 A US 5578228A US 37966595 A US37966595 A US 37966595A US 5578228 A US5578228 A US 5578228A
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United States
Prior art keywords
cutting
gas
melt
laser beam
seam
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Expired - Fee Related
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US08/379,665
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English (en)
Inventor
Eckhard Beyer
Kai-Uwe Preissig
Dirk Petring
Dieter Bingener
Hans-Dieter Riehn
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Thyssen Stahl AG
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Thyssen Stahl AG
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Assigned to THYSSEN STAHL AG reassignment THYSSEN STAHL AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BEYER, ECKHARD, BINGENER, DIETER, PETRING, DIRK, PREISSIG, KAI-UWE, RIEHN, HANS-DIETER
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/073—Shaping the laser spot
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • B23K26/125—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases of mixed gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/144—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the fluid stream containing particles, e.g. powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/146—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the fluid stream containing a liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/40—Removing material taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/16—Bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/18—Sheet panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26

Definitions

  • the invention relates to a process for the laser beam cutting of strip or plate workpieces, more particularly magnetic steel sheets having a thickness of ⁇ 1 mm, more particularly ⁇ 0.5 mm, wherein a laser beam emitted by a laser beam source melts the workpiece with the formation of a vapour capillary at the cutting point and the melt is driven off by a cutting gas consisting of an inert gas/hydrogen mixture.
  • the laser beam cutting of metallic workpieces more particularly the cutting of stainless steel sheet with a thickness of less than 1 mm is known from DE 36 19 513 A1.
  • the active cutting was in the inert cutting gas is oxygen, representing a proportion of 30 to 90% by volume of the cutting gas.
  • the oxygen is used for chemical exothermic reaction with the steel to generate additional thermal energy, so as to accelerate the cutting process.
  • the oxygen also cooperates with the cutting gas to drive the melt produced in the cutting zone out of the cutting seam of the sheet.
  • the oxidation products cannot be completely driven out of the cutting seam, so that cutting edges substantially free from oxidation products cannot be obtained.
  • the chemical exothermic reaction produces a comparatively large heat affected zone laterally of the cutting zone, and this leads to damage to the workpiece, more particularly a metal sheet and any coating disposed thereon.
  • the parting of magnetic steel sheets has long been regarded as an advantageous field for the application of laser cutting.
  • a CO 2 laser having a power of several hundred watts is used for the cutting of magnetic steel sheets having a thickness of less than 1 mm.
  • the workpiece is acted upon at the place of parking by an oxygen-containing gas emitted from a nozzle, the pressure upstream of the nozzle being over 5 bar.
  • cutting speeds of just 10 m/min can be reached, but such speeds are of no economic advantage in the case of magnetic steel sheets.
  • WO 88/01553 discloses the offsetting of the axis of the laser beam, which is enclosed by a nozzle for supplying gas to the cutting point, in relation to the axis of the pressure center of the gas nozzle, namely in the direction of the uncut sheet. This is based on the idea that the material must first be melted, so that it can then more satisfactorily be driven out of the cutting seam at a subsequent place.
  • that kind of laser beam cutting cannot be successfully used with thin sheets, if the intention is to perform cutting at high speeds.
  • a cutting process is also known (DE 39 34 920) which enables slots to be cut using a laser beam, cutting taking place with the use of an air jet or oxygen jet which is directed at the sheet upstream of the point of impingement of the laser beam.
  • Such a jet of reactive gas enables wide slots to be produced, the melt being driven out of the slots by the pressurized gas.
  • Such a process differs basically from the process according to the invention, which operates with an inert cutting gas, due to the reactive cutting gas.
  • the central axis of the laser beam lies within an inert cutting gas jet containing hydrogen and directed at the workpiece.
  • the cutting gas jet leads in the direction of cutting in relation to the axis of the laser beam and is so directed that the melt is continuously driven out of the cutting seam.
  • the hydrogen component of the cutting gas is set so high and the inert cutting gas enclosing the laser beam is taken to the surface of the melt at the cutting point at such a pressure and with such a pressure distribution that the vapour capillary remains closed at the bottom, the temperature at the surface of the melt is kept at vaporization temperature and the melt is continuously driven out of the cutting seam on the side away from the cutting direction of the vapour capillary. It is important to the invention to realize that the limits of classical Fresnel absorption for laser beams are exceeded by the high intensity required.
  • Partial evaporation in conjunction with a modified interaction geometry result in the formation of a plasma, which may give laser beams screening, and of a vapour capillary.
  • the vapour capillary is used according to the invention to reach higher cutting speeds, since a melted flux occurs in the cutting zone parallel with the workpiece surface around the vapour capillary, downstream of the vapour capillary melt is driven out of the cutting seam in the downward direction.
  • this on its own is not enough, since if the process is wrongly performed the melt may become dammed, with the risk that the melt and the adjacent marginal zones of the cutting seam will become overheated and the cutting seam will become widened. These events may result in the required speed increases remaining achieved, or substantially unachieved.
  • the pressure of the cutting gas mixture is adjusted and the highest possible proportion of hydrogen is admixed with the cutting gas, the aforedescribed undesirable events can be limited. It is true that a plasma is also produced by the evaporation of the material, that any screening effect of the plasma on the laser beam is practically obviated; more particularly, moreover, there are no obstacles to the melt being driven out.
  • hydrogen has a cooling effect, due to its light molecules, e.g., due to a high recombination rate per threefold collision (electron-ion-hydrogen), so that the risk can be obviated that the melt, the evaporated material and the plasma being formed will become overheated.
  • Another important aspect is that the surface tension of the melt is reduced by the hydrogen, and this counteracts the damming of the melt and any consequent obstacle to its being driven off.
  • the process according to the invention results in burr-free cutting edges and the least possible effect on the zones of the material to be parted which adjoin the cutting edges, accompanied by further increased cutting speeds; this is of importance more particularly for grain-oriented magnetic steel sheets.
  • the cutting gas contains a proportion of up to 25% by volume of hydrogen. It was possible to achieve speed increases of approximately 15% in comparison with the prior art as disclosed in the aforementioned "DVS-Bericht".
  • Suitable pressures for the inert cutting gas with a CO 2 laser are between 3 bar and 8 bar.
  • substantially higher pressures are used, namely tp to 50 bar.
  • nitrogen or argon as the inert cutting gas. These are industrially available cheap gases. While nitrogen as a rule is particularly suitable for workpieces of ferrous metals, argon may mainly show advantageous inert behaviour with non-ferrous metals.
  • the laser beam is focused on an oval focal spot with main axis extending in the cutting direction.
  • the intensity of the laser beam is reduced, referred to the cutting front, thus obviating any undesirable vaporization to the workpiece with a correspondingly heavy plasma formation.
  • Another feature favourable to high cutting speed is the focused focal spot of the laser beam is kept at half the height of the workpiece (in the centre of the workpiece thickness).
  • the inert cutting gas is guided eccentrically of the laser beam axis and impinges with a lead on the cutting point. Also advantageously the cutting gas impinges on the cutting point at an angle ⁇ 90°.
  • All the embodiments share the feature that the pressure centre of the inert cutting gas is shifted in the direction of the uncut workpiece. Due to this adjustment, a transverse pressure gradient is produced when the gas jet enters the cutting seam. This gradient produces a flow component in the direction of the longitudinal extension of the open cutting seam, thus achieving the quicker removal of the melt and the vapour from the zone of interaction between the laser beam and the sheet material, and also a reduced evaporation. The emergence of the melt is accelerated by cooperation between the reduction of the surface tension of the melt by the hydrogen of the cutting gas and the transverse pressure gradient thereof.
  • a laser beam of low mode order is selected--i.e., as high a beam quality coefficient K as possible, of preferably >0.5.
  • an additional jet consisting of gas, liquid or particles.
  • FIG. 1 a diagrammatic view of a laser beam cutting device in perspective
  • FIG. 2 a diagrammatic longitudinal section through the cutting zone of a workpiece of thickness d.
  • a cutting device 25 having a laser beam 21 is guided over a workpiece 10, the laser beam 11 being focused by an optical focusing system 12.
  • the focused laser beam 11 is directed at the workpiece 10 (sheet) which has a thickness d.
  • the laser beam 11 produces a cutting seam 16 in the sheet.
  • the cutting speeds are, for example, in the case of sheets having a thickness less than 1 mm, up to 250 m/min and more.
  • the cutting device 25 can be used, for example, in slipping and/or cut-to-length installations and also in trimming installations, where the sheet, for example, is wound off a coil.
  • the optical focusing system 12 has a focusing lens by which the laser beam 11 is so focused that the focus lies in the zone of half the sheet thickness d; of. FIG. 2.
  • focusing must be as strong as possible--i.e., the focus must be as small as possible. This can be achieved inter alia by the laser beam having as low a mode order as possible.
  • the laser beam 11 is enclosed by a gas nozzle 13 for cutting gas 14.
  • the cutting gas 14 impinges on cutting zone 20 of the sheet 10 in the direction of the laser beam 11.
  • the gas consists of an inert gas, such as nitrogen or argon, which is mainly used for driving out the melt 15 produced during cutting by the laser beam 11.
  • Also admixed with the cutting gas is hydrogen, whose effect will be further disclosed hereinafter.
  • Cutting at speeds corresponding to the prior art produces a cutting front 23 (FIG. 1) from which the melt 15 is directly driven out. It is impossible in this way to achieve optimum conditions for high cutting speeds with the lowest possible thermal stressing of zones 26 adjoining the cutting seam 16 and oxidation-free cutting edges 16. Only the use of the steps according to the invention enables a transition to be made to higher cutting speeds, the cutting seam then being closed at the bottom--i.e., the melt first remains in the seam, with the formation of a vapour capillary, as shown in FIG. 2. The formation and maintenance of the vapour capillary enables the melt to remain comparatively highly liquid.
  • FIG. 2 also shows how in the process according to the invention the cutting front 23 lies substantially flatter, namely with an angle of, for example, 65°-75°, in comparison with conventional cutting with pure or practically exclusive Fresnel absorption, where the angle is close to 90°--i.e., the cutting front 23 extends very steeply.
  • the flat cutting front 23 is explained in the case of thin sheets with the high ratio between focus diameter d f and sheet thickness d, in spite of the higher beam intensity and the stronger focusing.
  • FIG. 2 shows the laser beam 11 with a focus of diameter d f lying in the zone of the sheet thickness d.
  • the associated axis of the laser beam 11 has the reference 18.
  • the gas jet 13 is also constructed rotation-symmetrically, its axis having the reference 17.
  • the axis 17 is in this case a synonym for the pressure centre of the cutting gas 14, which can be seen from FIG. 1 to be supplied to the cutting zone 20.
  • a notable feature of the relative association of the gas nozzle 13 and the laser beam 11 is that the axis 17 of the gas nozzle 13 is disposed with an eccentricity e in relation to the axis 18 of the laser beam 11, being offset in the direction of the uncut sheet 10.
  • a transverse pressure gradient is produced in the longitudinal direction of the open cutting seam--i.e., perpendicularly to the axis 18.
  • the metal vapour produced is so affected that it is possible to obviate any screening effect of the metal vapour plasma.
  • the melt is removed more quickly in the direction of the comparatively flat cutting front 23.
  • FIG. 2 shows how a transverse pressure gradient of the cutting gas can also be produced by the gas nozzle 13 being disposed with axes 19 or 19' inclined in relation to the sheet 10.
  • the inclination and arrangement of the axes 19, 19' determines the value of the transverse pressure gradient.
  • the difference in the arrangement of the axes 19, 19' is that the axis 19 intersects the cutting front in the zone of the axis 18 in the cutting zone 20, while the axis 19' lies upstream of the aforementioned cutting point in the direction of the uncut sheet 10.
  • the cutting gas 14 impinges on the cutting front 23 and/or on the uncut sheet 10.
  • FIG. 2 shows the laser beam 11 with a focus of diameter d f .
  • the beam cross-section is therefore circular.
  • the laser beam 11 can also be focused preferably elliptically or elongate.
  • d f is the length of the major semi-axis of the ellipse, the ellipse being disposed in the cutting direction. Consequently, the intensity of the laser beam on the flat cutting front is reduced, and therefore the interaction surface when the laser beam is applied to the sheet is enlarged.
  • the cutting process can be stabilized thereby, since plasma formation and melt expulsion can be more satisfactorily controlled.
  • the width of the laser focus can be kept small and, correspondingly, so can the width of the cutting seam 16.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
US08/379,665 1992-08-12 1993-08-10 Process for the laser beam cutting of strip or plate workpieces, especially magnetic steel sheets Expired - Fee Related US5578228A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4226620.3 1992-08-12
DE4226620A DE4226620C2 (de) 1992-08-12 1992-08-12 Verfahren zum Laserstrahlschneiden von band- oder plattenförmigen Werkstücken, insbesondere von Elektroblech
PCT/EP1993/002123 WO1994004306A1 (de) 1992-08-12 1993-08-10 Verfahren zum laserstrahlschneiden von band- oder plattenförmigen werkstücken, insbesondere von elektroblech

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US (1) US5578228A (de)
EP (1) EP0655021B1 (de)
JP (1) JP3298884B2 (de)
AT (1) ATE143300T1 (de)
DE (1) DE4226620C2 (de)
DK (1) DK0655021T3 (de)
ES (1) ES2092403T3 (de)
FI (1) FI102520B (de)
NO (1) NO310601B1 (de)
WO (1) WO1994004306A1 (de)

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US5760368A (en) * 1994-07-08 1998-06-02 Fanuc, Ltd. Laser beam method using an inactive gas as the assist gas
US6060687A (en) * 1996-03-15 2000-05-09 Aga Aktiebolag Method of laser cutting metal workpieces
FR2816227A1 (fr) * 2000-11-09 2002-05-10 Air Liquide Procede de coupage laser a haute vitesse avec gaz adapte
US20020162604A1 (en) * 2001-03-09 2002-11-07 Olivier Matile Laser cutting method and apparatus with a bifocal optical means and a hydrogen-based assist gas
US6521864B2 (en) * 2000-01-10 2003-02-18 L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitatiion Des Procedes Georges Claude Method and apparatus for the laser cutting of mild steel or structural steel with a multifocus optical component
WO2003031109A1 (fr) * 2001-10-05 2003-04-17 Commissariat A L'energie Atomique Procede et dispositif de decoupe laser
EP2332688A1 (de) * 2009-12-08 2011-06-15 LCD Laser Cut AG Verfahren zum Herstellen eines magnetisierbaren Körpers
CN102186625A (zh) * 2008-09-17 2011-09-14 通快激光两合公司 用于无切割气体的激光熔化切割的方法
US20120024831A1 (en) * 2005-11-25 2012-02-02 La Soudure Autogene Francaise (Air Liquide Welding France) Method for Cutting Stainless Steel with a Fiber Laser
WO2012052115A1 (de) * 2010-10-23 2012-04-26 Volkswagen Aktiengesellschaft Verfahren zum laserschneiden eines elektrobandmaterials durch angepassten laserstrahlleistung, fokusdurchmesser und vorschub des laserstrahles
WO2012079834A1 (de) * 2010-12-14 2012-06-21 Robert Bosch Gmbh Verfahren zum abtragen von material mittels einer laserstrahlquelle
ITPI20110060A1 (it) * 2011-06-01 2012-12-02 Angelo Claudio D Un gas di processo per effettuare tagli utilizzando la tecnologia laser.
US20130146572A1 (en) * 2010-10-15 2013-06-13 Masao Watanabe Laser cutting device and laser cutting method
US9108271B2 (en) 2008-06-28 2015-08-18 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Oblique laser beam cutting
CN106695133A (zh) * 2016-12-28 2017-05-24 京磁新材料有限公司 钕铁硼磁体的激光切割方法
US20180354072A1 (en) * 2015-12-02 2018-12-13 Avonisys Ag Laser beam processing device comprising a coupling device for coupling a focused laser beam into a fluid jet
CN118081119A (zh) * 2024-04-23 2024-05-28 西安晟光硅研半导体科技有限公司 一种微射流激光加工头垂直度的调整方法

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DE10243147B4 (de) * 2002-09-17 2006-03-16 Siemens Ag Verfahren zum Einbringen einer Lochkontur in ein Werkstück
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DE102008053397B4 (de) * 2008-05-20 2012-12-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Schmelzschneiden von Werkstücken mit Laserstrahlung
CA3169793C (en) * 2020-04-06 2024-05-28 Souichiro Yoshizaki Electrical steel sheet machining method, motor, and motor core production method

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US5760368A (en) * 1994-07-08 1998-06-02 Fanuc, Ltd. Laser beam method using an inactive gas as the assist gas
US6060687A (en) * 1996-03-15 2000-05-09 Aga Aktiebolag Method of laser cutting metal workpieces
US6521864B2 (en) * 2000-01-10 2003-02-18 L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitatiion Des Procedes Georges Claude Method and apparatus for the laser cutting of mild steel or structural steel with a multifocus optical component
AU773653B2 (en) * 2000-01-10 2004-06-03 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and apparatus for the laser cutting of stainless steel, coated steel, aluminum or aluminum alloys with bifocal optical component
FR2816227A1 (fr) * 2000-11-09 2002-05-10 Air Liquide Procede de coupage laser a haute vitesse avec gaz adapte
WO2002038325A1 (fr) * 2000-11-09 2002-05-16 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de coupage laser a haute vitesse avec gaz adapte
US20040026387A1 (en) * 2000-11-09 2004-02-12 Olivier Matile High-speed laser cutting method wit adapted gas
US6891126B2 (en) * 2000-11-09 2005-05-10 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude High-speed laser cutting method with adapted gas
US20020162604A1 (en) * 2001-03-09 2002-11-07 Olivier Matile Laser cutting method and apparatus with a bifocal optical means and a hydrogen-based assist gas
WO2003031109A1 (fr) * 2001-10-05 2003-04-17 Commissariat A L'energie Atomique Procede et dispositif de decoupe laser
US20040232123A1 (en) * 2001-10-05 2004-11-25 Jean-Pascal Alfille Laser cutting method and device
US6847005B2 (en) 2001-10-05 2005-01-25 Commissariat A L'energie Atomique Laser cutting method
US20120024831A1 (en) * 2005-11-25 2012-02-02 La Soudure Autogene Francaise (Air Liquide Welding France) Method for Cutting Stainless Steel with a Fiber Laser
US9108271B2 (en) 2008-06-28 2015-08-18 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Oblique laser beam cutting
CN102186625A (zh) * 2008-09-17 2011-09-14 通快激光两合公司 用于无切割气体的激光熔化切割的方法
CN102186625B (zh) * 2008-09-17 2014-08-06 通快激光两合公司 用于无切割气体的激光熔化切割的方法
EP2332688A1 (de) * 2009-12-08 2011-06-15 LCD Laser Cut AG Verfahren zum Herstellen eines magnetisierbaren Körpers
US20130146572A1 (en) * 2010-10-15 2013-06-13 Masao Watanabe Laser cutting device and laser cutting method
CN103260812B (zh) * 2010-10-23 2016-05-04 大众汽车有限公司 通过适配激光束功率、焦点直径和进给的激光束切割电工钢带材的方法
CN103260812A (zh) * 2010-10-23 2013-08-21 大众汽车有限公司 通过适配激光束功率、焦点直径和进给的激光束切割电工钢带材的方法
WO2012052115A1 (de) * 2010-10-23 2012-04-26 Volkswagen Aktiengesellschaft Verfahren zum laserschneiden eines elektrobandmaterials durch angepassten laserstrahlleistung, fokusdurchmesser und vorschub des laserstrahles
WO2012079834A1 (de) * 2010-12-14 2012-06-21 Robert Bosch Gmbh Verfahren zum abtragen von material mittels einer laserstrahlquelle
ITPI20110060A1 (it) * 2011-06-01 2012-12-02 Angelo Claudio D Un gas di processo per effettuare tagli utilizzando la tecnologia laser.
US20180354072A1 (en) * 2015-12-02 2018-12-13 Avonisys Ag Laser beam processing device comprising a coupling device for coupling a focused laser beam into a fluid jet
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CN106695133A (zh) * 2016-12-28 2017-05-24 京磁新材料有限公司 钕铁硼磁体的激光切割方法
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CN118081119A (zh) * 2024-04-23 2024-05-28 西安晟光硅研半导体科技有限公司 一种微射流激光加工头垂直度的调整方法

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EP0655021A1 (de) 1995-05-31
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JP3298884B2 (ja) 2002-07-08
NO950492L (no) 1995-02-09
JPH08500060A (ja) 1996-01-09
EP0655021B1 (de) 1996-09-25
FI102520B1 (fi) 1998-12-31
DE4226620A1 (de) 1994-02-17
WO1994004306A1 (de) 1994-03-03
DE4226620C2 (de) 1995-01-19
FI950599A0 (fi) 1995-02-10
FI102520B (fi) 1998-12-31
NO950492D0 (no) 1995-02-09
DK0655021T3 (de) 1997-02-24
ES2092403T3 (es) 1996-11-16
ATE143300T1 (de) 1996-10-15

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